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| Patent # | Description |
|---|---|
| US-4,672,338 |
Saw filter having response enhanced via dampening An electrical surface acoustic wave filter with a wafershaped substrate (1) of monocrystalline, piezoelectric material, in particular lithium niobate, wherein... |
| US-4,672,337 |
VLF/HF EMI filter An EMI filter for use in a low frequency radio receiver. The device is inserted in the signal line between the receiver and its antenna to provide both common... |
| US-4,672,336 |
Attenuators An attenuator is in the form of a pad comprising a coating of resistive material which connects an input port, an output port and a pair of linked constant... |
| US-4,672,335 |
Printed circuit wiring board having a doped semi-conductive region
termination A matched load for an unloaded terminating end of a signal transmission line on a printed circuit wiring board avoids reflecting pulses back down the line. A... |
| US-4,672,334 |
Dual-band circular polarizer A dual band circular polarizer for simultaneously transforming two to four linearly polarized waves of two different frequency bands into two to four circularly... |
| US-4,672,333 |
Waveguide junction circulator A waveguide circulator includes a resonator body which is separated from a waveguide side by a dielectric spacer disc. The spacer disc has an interface turned... |
| US-4,672,332 |
RC oscillator having plural differential threshold stages This high accuracy, RC oscillator, particularly for monitors, has different switch-over thresholds independent from such variable parameters as the saturating... |
| US-4,672,331 |
Signal conditioner for electromagnetic flowmeter A voltage to frequency converter or conditioner adapted for use with electromagnetic flowmeters produces a signal whose output frequency is related to measured... |
| US-4,672,330 |
Phase-lock loop systems A phase-lock loop system with particular use in radar tracking systems is disclosed. From a number of input signals of varying frequencies such as a carrier... |
| US-4,672,329 |
Clock generator for digital demodulators A clock generator for digital demodulators includes a voltage-controlled oscillator for generating clock pulses at controlled frequency and phase in response to... |
| US-4,672,328 |
Waveguide-mounted amplifier A metal partition wall is placed inside a waveguide without ridge or the like and has an aperture in which a GaAs-FET is located, so that the input and output... |
| US-4,672,327 |
Self-biasing for enhancement-mode field effect transistors Signals applied to the gate of an enhancement-mode field effect transistor by resistive coupling, via a dc-blocking capacitor, are self-biased. The self biasing... |
| US-4,672,326 |
Limited output operational amplifier This operational amplifier has an output range comprised between values adjustable as desired and includes a differential input stage and an output gain stage,... |
| US-4,672,325 |
Clock frequency detection circuit A clock detector has a D flip-flop having a D terminal, a reset terminal and a clock terminal, a first saw-tooth wave signal generator having a first time... |
| US-4,672,324 |
Flame protection circuit A flame control circuit becomes a flame protection circuit when the whole circuit is also controlled with respect to correct operation. A final output signal 32,... |
| US-4,672,323 |
Device for measuring the internal pressure of an operationally built
built-in vacuum switch A device for measuring the internal pressure of an operationally built-in vacuum switch which comprises a vacuum switching tube having a switching chamber and... |
| US-4,672,322 |
High sensitivity conductivity detector A high sensitivity conductivity detector for ion chromatography includes an isolated fluid cell and a measuring circuit including an operational amplifier having... |
| US-4,672,321 |
Method and apparatus for electromagnetically surveying a remote elongate
conductor employing a detector... Apparatus for locating or monitoring the condition of an inaccessible conductor comprises an antenna for receiving electrical signals due to an alternating... |
| US-4,672,320 |
Imaging apparatus and method using nuclear magnetic resonance An NMR imaging apparatus and method for direct Fourier imaging. This apparatus includes a static magnetic field generator, gradient magnetic field generators,... |
| US-4,672,319 |
Multiple pulse excitation in NMR imaging Improved nuclei excitation for NMR applications is provided by employing a sequence of RF pulses for exciting the nuclei. Non-linearities in pulse excitation are... |
| US-4,672,318 |
Method of measuring the static magnetic field distribution in an NMR
inspection system A method of measuring a static magnetic field distribution in a nuclear magnetic resonance (NMR) inspection system which comprises magnetic field generator for... |
| US-4,672,317 |
Multi-gap head apparatus for use with a magnetic scale A multi-gap head apparatus employed in a measuring system using a magnetic scale. First and second thin plates, making up core members, are stamped out with a... |
| US-4,672,316 |
Method for calibrating a muzzle velocity measuring device In order to be able to carry out accurate measurements with a V.sub.0 -measurement device, it is important that the desired distance between the two measurement... |
| US-4,672,315 |
Circuit arrangement for monitoring a thyristor A circuit arrangement for monitoring a thyristor comprising an auxiliary thyristor disposed between the anode terminal and gate terminal the thyristor, and a... |
| US-4,672,314 |
Comprehensive semiconductor test structure A structure for measuring electrical and physical characteristics of a semiconductor region includes a semiconductor region having a first portion of width... |
| US-4,672,313 |
Device for checking mobile electrical charges in a MOS integrated circuit A device for checking the mobile electrical charges in a MOS integrated circuit having a wafer support, a polarization means applying a potential difference... |
| US-4,672,312 |
Giga-hertz test jig Gigahertz test jig apparatus (10) is disclosed for providing accurate and reliable evaluation of a wide variety of test devices which propagate signals having... |
| US-4,672,310 |
Switch position sensing device for use with valve operators A switch position sensing device gives visual and recorded information as to the relative open and closed position of a monitored switch whether the monitored... |
| US-4,672,309 |
RF personnel dosimeter and dosimetry method for use therewith A method and apparatus adapted to be worn by a person for measuring radio frequency (RF) energy absorbed by a person's body in the frequency range of 10 KHz-42... |
| US-4,672,308 |
Enhanced frequency determination for spectrum analyzers or the like An arrangement is provided for enhancing the accuracy of frequency determination in a spectrum analyzer or the like having a local oscillator heterodyned with... |
| US-4,672,307 |
Simplified delay testing for LSI circuit faults Thorough delay testing of a combinational logic circuit is accomplished by changing only one input at a time (a single transition), and checking the output at a... |
| US-4,672,306 |
Electronic probe having automatic readout of identification and status An electronic probe assembly provides previously recorded data as to probe identification and optimum compensation tuning of the probe to a connected ... |
| US-4,672,305 |
Storm warning method and apparatus Electric (E) and magnetic (H) field components of a lightning stroke are separately received in order to determine and display the location of regions of... |
| US-4,672,304 |
Reference voltage source The present invention relates to a reference voltage source in CMOS technology. The reference voltage source is based on the use of two compatible bipolar... |
| US-4,672,303 |
Inductor current control circuit A DC to DC power converter having reduced switching loss for operation at high frequencies. As disclosed, a buck, or forward, converter includes a first FET as... |
| US-4,672,302 |
Circuit for controlling the load current level in a transistor A circuit for limiting the load current through a transistor switch, where the load is connected between the collector of the transistor switch and a first power... |
| US-4,672,301 |
Power controller circuit with automatic correction for phase lag between
voltage and current What is proposed is an electronic circuit for controlling the amount of AC power delivered to an inductive or resistive load which continuously measures the... |
| US-4,672,300 |
Direct current power supply using current amplitude modulation A switched-mode power supply for producing a DC voltage output from a unidirectional-current or alternating-current input uses amplitude modulation of current... |
| US-4,672,299 |
Clock control circuit for phase control There is disclosed a clock circuit for a PBX system that uses phase locked loop technology to perform synchronization between two input signals. The system can... |
| US-4,672,298 |
Power factor correction system A power-factor correction system for reactive power control and concomitant power factor correction adapted to cooperate with a line supplying power at a given... |
| US-4,672,297 |
AC generator control status detecting device with short-circuit
protection means An AC generator control status detecting device having an AC generator with a plurality of stator coils, a field coil and a plurality of rectifying diodes... |
| US-4,672,296 |
Mobile emergency medical vehicle with auxiliary engine/generator
providing AC/DC output This invention relates to a mobile emergency medical vehicle having a main transport engine and a medical equipment, supply and patient compartment or module,... |
| US-4,672,295 |
Battery charger circuit A battery charger circuit having a main transformer and a boost transformer. The main transformer supplies power to produce a DC main charging current at the... |
| US-4,672,294 |
Dual battery system with improved overvoltage protection A dual voltage, dual battery electrical supply system for automotive vehicles is disclosed. Two batteries are connected in series and a high voltage regulator... |
| US-4,672,293 |
Power-supply/battery back-up power supply/battery charger combination Power supply comprising an AC to DC power supply and a DC to DC power supply and a DC battery charging circuit within a single device, which device provides... |
| US-4,672,292 |
System for charging sets of rechargeable batteries The present invention relates to a system for charging a plurality of sets of rechargeable electric batteries incorporated in respective portable appliances. The... |
| US-4,672,291 |
Variable-speed electrical machine This invention pertains to an electrical machine whose excitation is coordinated to the respective rpm in such a fashion that a desired characteristic of induced... |
| US-4,672,290 |
Circuit arrangement in which a capacitor unit is connected in series
with an a.c. load A circuit arrangement is disclosed in which a capacitive unit suitable for a.c. operation is connected in series with an a.c. load. An extension of the life of... |
| US-4,672,289 |
Circuit configuration incorporating an A.C.-fed load connected in series
with a capacitor unit A circuit arrangement in which an a.c. load is connected in series with a capacitor unit suitable for a.c. connection. In such a circuit arrangement, the use of... |
| US-4,672,288 |
Torque controller for an AC motor drive and AC motor drive embodying the
same In an induction motor drive a signal representative of the torque T as derived by sensing only the stator armature current I, and the slip frequency f.sub.2 and... |
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